So what's the magic trick? It's "cloning". Here's how
I did it. Take the original photograph and paste a side-by-side copy in your
image editor. Grey-scale the original, then bump the color depth back up to 16
million. Enlarge them both, so you can get really detailed. Then position the
cloning brush over the original, making sure to mark the exact X/Y coordinates
when you lock it in. Move to the copy and place the brush on those identical coordinates before you
begin the clone process. At that point it's simply a matter of brushing
in the color wherever you like.
Of course, it takes a little getting used to. And you quickly
discover how to adjust the brush hardness and size to suit your subject.
But after I did a couple of pictures, it became really easy.
Pretty cool stuff, huh?